Ah, the financial markets. A bastion of rational expectation, calculated risk, and sober analysis. Or, at least, that’s what the textbooks tell us. In the era of Donald J. Trump, however, this venerable institution often resembles a particularly caffeinated squirrel navigating a minefield of its own making. Every pronouncement, every tweet (or Truth Social post, as the case may be), sends ripples, sometimes tsunamis, through global equities. And today, September 17, 2025, was no different, offering a fresh ...